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EP 4 183 067 A1

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(43) Date of publication: 24.05.2023 Bulletin 2023/21 (21) Application number: 21841232.8 (22) Date of filing: 13.07.2021

(51) International Patent Classification (IPC):  H04B 10/27(2013.01) H04B 10/50(2013.01) H04L 9/08(2006.01) H04B 10/079(2013.01) H04B 10/60(2013.01) (52) Cooperative Patent Classification (CPC): H04L 9/003; H04L 9/0852; H04B 10/70 (86) International application number: PCT/SG2021/050408 (87) International publication number: WO 2022/015241 (20.01.2022 Gazette 2022/03)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 14.07.2020 SG 10202006706W (71) Applicant: National University of Singapore Singapore 119077 (SG)

(72) Inventors: WANG, Chao Singapore Faculty of Engineering, Department of Electrical and Computer Engineering 21 Lower Kent Ridge Road Singapore 119077 (SG) LIM, Ci Wen Singapore Faculty of Engineering, Department of Electrical and Computer Engineering 21 Lower Kent Ridge Road Singapore 119077 (SG) GOH, Koon Tong Singapore Faculty of Engineering, Department of Electrical and Computer Engineering 21 Lower Kent Ridge Road Singapore 119077 (SG) (74) Representative: Viering, Jentschura & Partner mbB Patent- und Rechtsanwälte  Am Brauhaus 8 01099 Dresden 01099 Dresden (DE)